Slant/Fin Error Lockout 82: Stack
The stack (flue gas) temperature exceeded the limit and the control locked out. Documented causes are a dirty heat exchanger/combustion chamber or an incorrectly set 'Stack limit setpoint'. The manual notes the stack limit is set to a maximum of 220°F (104°C), or 149°F (65°C) in Canada with PVC venting. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The stack (flue gas) temperature exceeded the limit and the control locked out. Documented causes are a dirty heat exchanger/combustion chamber or an incorrectly set 'Stack limit setpoint'. The manual notes the stack limit is set to a maximum of 220°F (104°C), or 149°F (65°C) in Canada with PVC venting.
Slant/Fin fault codes can vary by model and series. Use this as a guide — the same code can have more than one cause. Our Technical Safety BC–licensed technicians read the code, confirm it against your unit's manual, and diagnose the true cause before any repair.
Likely causes of Slant/Fin error Lockout 82
- Dirty/fouled heat exchanger or combustion chamber raising flue temperature
- Stack limit setpoint set too low for the installation
- Scale or magnetite buildup reducing heat transfer
- Improper combustion settings producing excess flue heat
What you can safely check
- Note how long the boiler runs before the lockout for the technician
- Schedule heat-exchanger / combustion-chamber cleaning if maintenance is overdue
Beyond these checks, do not open the unit or touch gas/electrical parts — BC law requires a licensed gas fitter. Call us for a proper diagnosis.
Error Lockout 82 usually leaves you without heat or hot water and can indicate a safety-related fault. Don't keep resetting it — call for priority after-hours Slant/Fin repair.
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Parts often behind Slant/Fin error Lockout 82
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Slant/Fin Error Lockout 82 Repair Across Metro Vancouver
Related Slant/Fin Venting & Combustion Codes
Frequently Asked Questions
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